diff --git a/preamble.tex b/preamble.tex
index 30dab7f..316292c 100644
--- a/preamble.tex
+++ b/preamble.tex
@@ -15,7 +15,7 @@
 % ========================================
 
 \hypersetup{colorlinks=true, urlcolor=blue}
-\newcommand{\leanref}[2]{\color{blue}$\pmb{\exists}\;{-}\;$\href{#1}{#2}}
+\newcommand{\leanref}[2]{{\color{blue}$\pmb{\exists}\;{-}\;$}\href{#1}{#2}}
 
 % ========================================
 % Environments